Urocystis destruens McAlpine

Description

Sori on leaves, leaf sheaths and stems, forming ellipsoidal or fusiform pustules 1–2 mm long or longer by confluence, at first covered by the greyish or lead-coloured epidermis that ruptures irregularly exposing the black granular-powdery mass of spore balls.

Spore balls globose, ellipsoidal to slightly irregular, 20–40 (–50) × 18–30 µm, yellowish to reddish brown, composed of 1 (–3) fertile spores completely surrounded by sterile cells.

Spores globose, subglobose, ellipsoidal to slightly irregular, 12.0–17.5 × 10.0–13.5 µm, yellowish to reddish brown; wall uniformly c. 1 µm thick, smooth.

Sterile cells globose, ellipsoidal, subcuneiform or irregular, with 1 or several flattened sides, 5–16 µm long, yellow; wall even or slightly uneven, 0.5–2.0 (–2.5) µm thick, smooth.

Hosts
   
Host family: Liliaceae
   
Host species: Wurmbea dioica (R.Br.) F.Muell.

Distribution

States & Territories: VIC